Ohm's Law and Circuit Relationships

In what year did Georg Ohm work on circuits?

What three components are involved in the relationship that Georg Ohm discovered?

How did Georg Ohm describe the relationship between current, voltage, and resistance?

When the resistance in a circuit decreases, the current will decrease.

If you add more obstacles (resistance), the runners (current) will be slower.

Which of the following can increase the resistance in a circuit?

In the table provided, what happens to the current as the resistance decreases, while the voltage remains the same?

What would happen to the resistance if the voltage was increased while the current remained the same?

What would happen to the current if the voltage was increased while the resistance remained the same?

Ohm's Law

German scientist Georg Ohm studied circuits in 1827
Discovered relationship between current, voltage, and resistance
Mathematically described this relationship

First Relationship

Resistance increases, current decreases
Analogy: obstacle course, more obstacles (resistance) mean slower runners (lower current)
Increasing resistance methods:
- Connecting more loads in series
- Making a conductor longer
- Making a conductor thinner
- Using a material with higher resistance

Second Relationship

Resistance decreases, current increases
Analogy: obstacle course, fewer obstacles (lower resistance) mean faster runners (higher current)
Decreasing resistance methods:
- Connecting fewer loads in series, or more loads in parallel
- Making a conductor shorter
- Making a conductor thicker
- Using a material with lower resistance

Voltage, Current, and Resistance (Example Data)

Constant voltage (120V), varying current and resistance
Light bulb (60W): 0.50A, 240Ω
Coffee grinder: 1.20A, 100Ω
Food dehydrator: 4.60A, 26Ω
Toaster oven: 14.0A, 8.6Ω
Pattern: higher current, lower resistance (with constant voltage)
If current stays the same and voltage increases, resistance must also increase.
If resistance stays the same and voltage increases, current must also increase.

Explore the fundamental principles of Ohm's Law, elaborated by Georg Ohm in 1827. This quiz examines the relationships between voltage, current, and resistance, including how to manipulate resistance to affect current in circuits. Test your understanding of the core concepts and applications of electrical circuits.